Today | Weather | Wednesday, August 12, 2026

Active Weather Warnings

Flood Watch

Weather in Flagstaff, Arizona

04:14 AM

Now

55° F

Feels Like 55°

Precipitation 20 %

Wind 4 mph

Humidity 87 %

Today

Day 73°

Night 54°

Precipitation 55 %

Wind 9 mph

UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Flagstaff Weather Forecast Updated

12 minutes ago

Last updated on August 12, 2026 at 4:02 AM

Air Quality in Flagstaff

NOW

25 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 4.89 µg/m³

PM₁₀ 13 µg/m³

O₃ 0.027 ppm

NO₂ 2.2 ppb

SO₂ 0.2 ppb

CO 0.10 ppm

NH₃ 0.69 µg/m³

NO 0 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 4.89 µg/m³

PM₁₀ – 13 µg/m³

O₃ – 53.81 µg/m³

NO₂ – 4.18 µg/m³

SO₂ – 0.48 µg/m³

CO – 112.76 µg/m³

NH₃ – 0.69 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Flagstaff

Severe Future Possible

Flood Watch

Flood Watch issued August 12 at 1:11AM MST until August 13 at 12:00AM MST by NWS Flagstaff AZ

Aug 12, 1:00 PM → Aug 13, 1:00 AM

WHAT: Elevated potential for Flash Flooding due to excessive
rainfall.

WHERE: Yavapai County, Coconino County, Navajo County, Apache
County and northern Gila County.

WHEN: From Noon MST Wednesday through Midnight MST Wednesday
evening.

IMPACTS: Flash flooding will be possible in creeks, normally dry
washes, swimming holes, and over recently burned areas. Raging
killer currents will be possible in side canyons and narrow slot
canyons. Low-water crossings may be flooded.

ADDITIONAL DETAILS:
- High moisture values and increased instability will lead to
strong thunderstorms today and this evening.
- Additional information is available at weather.gov/flagstaff.

+ Read More

Have a way to receive Flash Flood Warnings and be prepared to take action should warnings be issued. Consider changing your plans if you were going to hike, boat, or paddleboard to a slot canyon or normally dry wash. If you do still decide to recreate, check in at a nearby visitor center or ranger station.

Updated: Aug 12, 5:02 AM Source: NWS Alert